Industrial drilling tools

Claim 1

AS AN ARTICLE OF MANUFACTURE, A DRILL BIT COMPRISING HARD SHARP CUTTING PARTICLES COMPRISING ONE OF THE MATERIALS FROM THE GROUP CONSISTING OF DIAMONDS AND METALLIC CARBIDES EMBEDDED IN A PRESSED AND SINTERED ALLOY OF HOMOGANEOUS COMPOSITION, HIGH STRENGTH AND HARDNESS, HIGH THERMAL EXPANSION AND HIGH ABRASION AND SHOCK RESISTANCE COMPRISING 90-60% BY WEIGHT OF A FIRST SEPARATELY PREPARAED MIXTURE AND 10-40% BY WEIGHT OF A SECOND SEPARATELY PREPARED MIXTURE IN WHICH SAID FIRST MIXTURE COMPRISES 94% BY WEIGHT OF AT LEAST ONE METAL CARBIDE OF THE GROUP CONSISTING OF TUNGSTEN, TITANIUM, ZIRCONIUM, VANADIUM, CHROMIUM, TANTALUM AND MOLYBDENUM AND 6% BY WEIGHT OF COBALT AND SAID MIXTURE COMPRISES 65% BY WEIGHT OF NICKEL AND BERYLLIUM COMBINED, 25% BY WEIGHT OF MANGANESE AND 10% BY WEIGHT OF COPPER IN WHICH THE BERYLLIUM IS NOT LESS THAN .25% NOR MORE THAN 3.0% OF THE TOTAL OF SAID SECOND MIXTURE AND WELDED TO A METALLIC SHANK.